Determine if the equation is an identity.cos 2x = sin2 x - cos2 x
A. Yes
B. No
Answer: B
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Find the exact value under the given conditions.sin ? = - 
, 
< ? < 2?; cos ? = - 
, ? < ? < 
Find sin (? - ?).
A. 
B. 
C. 
D. 
Perform the operations.
?
?
A. 33 B. 39 C. 36 D. 37 E. 300
Write as a trigonometric function of a single angle, then evaluate. Round to the nearest ten-thousandth when necessary.
A. tan 10° ? 0.1763 B. tan 68° ? 2.4751 C. tan(-10°) ? -0.1763 D. tan 68° ? 0.404
Solve.The formula for the area of a square is A = s2 where s is the length of a side. Use this formula to find the length of a side of a building which has a square base with an area of 1725 square meters. Give your answer in exact form and as a decimal rounded to the nearest hundredth of a meter.
A. 25
? 207.67 meters
B. 2,975,625 meters
C. 69
? 154.29 meters
D. 5
? 41.53 meters